THE OZONE HOLE

THE OZONE HOLE

1. A fraction of the radiant energy producted sun ultraviolet (UV)

   • is so energetic that it can damage biological molecules.

2. 1985

   • British atmospheric scientists
     • published the startling news that springtime levels of stratospheric ozone
       • Artarcticahad declined by more than 40% since
         • 1977.

3. the ozone hole is caused primarily

   • by human production
   • release of chlorofluorocarbons
     • (CFCs)

4. 1987

   • montreal protocol
   • subsequent amendments set limits
     • established phase-out
       • periods for several ozone-depleting substance,.

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